Abstract
We constructed a hydrophone using porous piezoelectric ceramics and conducted a detailed investigation into hydrophone sensitivity under higher pressure and its acceleration sensitivity as vibrational noise. At a pressure of 7.85 MPa, the hydrophone sensitivity of the porous piezoelectric ceramic hydrophone was some 20 dB higher than that of the piesoelectric ceramic hydrophones. The difference in acceleration sensitivity between the porous piezoelectric ceramics and the piezoelectric ceramics was extremely minor. The hydrophone sensitivity is sufficiently high to allow us to consider vibrational noise as negligible.
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